In this letter, we, for the first time, report on coherent anti-Stokes Raman scattering (CARS) spectroscopy of an ensemble of silicon nanowires (SiNWs) formed by wet chemical etching of crystalline silicon with a mask of silver nanoparticles. The fabricated SiNWs have diameter ranged from 30 to 200 nm and demonstrate both visible and infrared photolumine cence (PL) and spontaneous Raman signal, with their intensities depending on presence of silver nanoparticles in SiNWs. The efficiency of CARS in SiNW ensembles is found to be significantly higher than that in crystalline silicon. The results of CARS and PL measurements are explained in terms of resonant excitation of the electron states attributed to silicon nanoparticles.

中文翻译：

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硅纳米线集合中的相干反斯托克斯拉曼散射

在这封信中，我们首次报告了硅纳米线 (SiNW) 集合的相干反斯托克斯拉曼散射 (CARS) 光谱，该硅纳米线 (SiNW) 是通过使用银纳米粒子掩膜对晶体硅进行湿法化学蚀刻而形成的。制造的 SiNW 的直径范围为 30 到 200 nm，并表现出可见光和红外光致发光 (PL) 和自发拉曼信号，其强度取决于 SiNW 中银纳米颗粒的存在。发现在 SiNW 系综中 CARS 的效率显着高于在晶体硅中的效率。CARS 和 PL 测量的结果是根据归因于硅纳米粒子的电子态的共振激发来解释的。